How to Lowercase a List Online
Email addresses, usernames, hashtags, and category tags often need to be compared or deduplicated as lowercase, even when the original data is a mix of cases from different sources. Retyping a whole list to fix the casing isn't necessary - it's one setting.
Quick answer
Paste your list into Text Fixer and set Case to lowercase in the options panel. Every line converts instantly. The same dropdown also offers UPPERCASE and Capitalize (Each Word), if you need the opposite conversion instead.
Lowercase your list now. Free, nothing to install.
Open Text Fixer →How to lowercase a list in 2 steps
- Paste your list into Text Fixer, one item per line.
- Open Options and set Case to lowercase - the output updates instantly.
Example
A mixed-case list like this:
John.Smith@Example.com JANE.DOE@EXAMPLE.COM Bob.Jones@example.com
converts to:
john.smith@example.com jane.doe@example.com bob.jones@example.com
This is a common prep step before deduplicating a list of emails or usernames, since "John.Smith@Example.com" and "john.smith@example.com" would otherwise be treated as two different entries in a case-sensitive comparison.
Other case options in the same dropdown
Lowercase isn't the only conversion available in the Case dropdown:
- UPPERCASE - converts every line to all capitals, useful for constants or codes that follow an all-caps convention.
- Capitalize (Each Word) - capitalizes the first letter of each word while lowercasing the rest, useful for names and titles.
- Unchanged - leaves casing exactly as typed, the default when no case conversion is needed.
Lowercasing before comparing or deduplicating two lists?
Compare Two Lists has its own case-sensitivity toggle, so you may not need to pre-lowercase at all.